src/gallium/auxiliary/rtasm/rtasm_execmem.c

   1 /**************************************************************************
   2  *
   3  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included
  13  * in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  19  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  20  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  **************************************************************************/
  23
  24
  25 /**
  26  * \file exemem.c
  27  * Functions for allocating executable memory.
  28  *
  29  * \author Keith Whitwell
  30  */
  31
  32
  33 #include "pipe/p_compiler.h"
  34 #include "util/u_debug.h"
  35 #include "os/os_thread.h"
  36 #include "util/u_memory.h"
  37
  38 #include "rtasm_execmem.h"
  39
  40 #if defined(PIPE_OS_BSD)
  41 #define MAP_ANONYMOUS MAP_ANON
  42 #endif
  43
  44 #if defined(PIPE_OS_WINDOWS)
  45 #ifndef WIN32_LEAN_AND_MEAN
  46 #define WIN32_LEAN_AND_MEAN 1
  47 #endif
  48 #include <windows.h>
  49 #endif
  50
  51 #if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS)
  52
  53
  54 /*
  55  * Allocate a large block of memory which can hold code then dole it out
  56  * in pieces by means of the generic memory manager code.
  57  */
  58
  59 #include <unistd.h>
  60 #include <sys/mman.h>
  61 #include "os/os_thread.h"
  62 #include "util/u_mm.h"
  63
  64 #define EXEC_HEAP_SIZE (10*1024*1024)
  65
  66 pipe_static_mutex(exec_mutex);
  67
  68 static struct mem_block *exec_heap = NULL;
  69 static unsigned char *exec_mem = NULL;
  70
  71
  72 static void
  73 init_heap(void)
  74 {
  75    if (!exec_heap)
  76       exec_heap = u_mmInit( 0, EXEC_HEAP_SIZE );
  77
  78    if (!exec_mem)
  79       exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE,
  80                                         PROT_EXEC | PROT_READ | PROT_WRITE,
  81                                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
  82 }
  83
  84
  85 void *
  86 rtasm_exec_malloc(size_t size)
  87 {
  88    struct mem_block *block = NULL;
  89    void *addr = NULL;
  90
  91    pipe_mutex_lock(exec_mutex);
  92
  93    init_heap();
  94
  95    if (exec_heap) {
  96       size = (size + 31) & ~31;  /* next multiple of 32 bytes */
  97       block = u_mmAllocMem( exec_heap, size, 5, 0 ); /* 5 -> 32-byte alignment */
  98    }
  99
 100    if (block)
 101       addr = exec_mem + block->ofs;
 102    else
 103       debug_printf("rtasm_exec_malloc failed\n");
 104
 105    pipe_mutex_unlock(exec_mutex);
 106
 107    return addr;
 108 }
 109
 110
 111 void
 112 rtasm_exec_free(void *addr)
 113 {
 114    pipe_mutex_lock(exec_mutex);
 115
 116    if (exec_heap) {
 117       struct mem_block *block = u_mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
 118
 119       if (block)
 120          u_mmFreeMem(block);
 121    }
 122
 123    pipe_mutex_unlock(exec_mutex);
 124 }
 125
 126
 127 #elif defined(PIPE_OS_WINDOWS)
 128
 129
 130 /*
 131  * Avoid Data Execution Prevention.
 132  */
 133
 134 void *
 135 rtasm_exec_malloc(size_t size)
 136 {
 137    return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
 138 }
 139
 140
 141 void
 142 rtasm_exec_free(void *addr)
 143 {
 144    VirtualFree(addr, 0, MEM_RELEASE);
 145 }
 146
 147
 148 #else
 149
 150
 151 /*
 152  * Just use regular memory.
 153  */
 154
 155 void *
 156 rtasm_exec_malloc(size_t size)
 157 {
 158    return MALLOC( size );
 159 }
 160
 161
 162 void
 163 rtasm_exec_free(void *addr)
 164 {
 165    FREE(addr);
 166 }
 167
 168
 169 #endif